Optimize msa removing from the session database

1. Open a big msa, e.g. "_common_data/clustal/10000_sequences.aln".
2. Remove it from the project.
   Current state: "Delete objects" task can't be canceled and it works long enough.

Currently, the most time is consuming by SQLiteMsaDbi::deleteRowsData(). It executes a single query that takes about 23 seconds on my computer. The query can't be interrupted, so the task can't be canceled.
Improve msa data removing from the database: it should be fast or, at least, it should be cancelable.